A consensus method, a blockchain system and a consensus node. The consensus method comprises: a first round, which comprises: a first consensus node broadcasting a first message, wherein the first message comprises a transaction set of a consensus proposal and a signature of the first consensus node; a second round, which comprises: a consensus node that receives the first message broadcasting a second message, wherein the second message comprises votes and signatures for the transaction set, which votes comprise a summary value of the transaction set; and a third round, which comprises: a consensus node that receives the second message collecting at least quorum of consistent votes from different consensus nodes, and if the consensus node has not broadcast a different vote on the proposal, the consensus node then broadcasting a third message, wherein the third message comprises the summary value and a set of collected signatures; and after collecting at least quorum of third messages from different nodes, the consensus node taking a transaction set, which corresponds to the summary value, as at least part of a consensus result, and outputting the transaction set.